Chalcedony Thin Section
Chalcedonic quartz is length fast.
Chalcedony thin section. Chalcedony is a dense more or less translucent but never transparent and never opaque material. Quartz thin section under polarizing microscope duration. Chalcedony has a fibrous texture with fibres tens to hundreds of micrometres in length.
The quartz fibers that make up chalcedony are typically aligned in a parallel or spherulitic fashion and have a feathery appearance. It occurs in radiating spherulitic textures and has overlays frequently brown and zoned in thin section. When illuminated from the back it may look slightly red.
13 quartz chalcedony crystal plates 2018 duration. Chalcedony may form the cement in clastic sediments or may form colloform or encrusting masses. Large number of pages viewed.
Below are photomicrographs of chert chalcedony from the same thin section of gunflint chert at the blende lake iron occurrence in macgregor township of thunder bay district ontario canada.